Many examples of earthquake damage show that liquefied lateral spreading is the main cause of pile foundation failure. Rigid drainage piles (RDPs), with two drainage grooves and plastic drainage plates, are a new type of liquefaction-resistant pile that can take into account the bearing capacity and drainage function. A series of 1g shaking table tests was carried out to analyse the seismic response of an RDP–superstructure–quay wall system subjected to lateral spreading. Three levels of earthquake intensities – small (peak ground acceleration (PGA) of 0.05g), moderate (PGA = 0.1g) and large (PGA = 0.2g) – were investigated. The improvement in the anti-liquefaction performance using RDPs was analysed. The influences of far-field (FF) and near-field (NF) ground motions were also examined. The experimental results showed that RDPs can effectively reduce the liquefaction degree and the horizontal flow of the sand stratum. In addition, the internal force and displacement of the superstructure built on RDPs were small. The seismic response due to NF ground motion was found to be more significant than that of the FF ground motion, but the effects of FF ground motion cannot be disregarded. The results of the tests could provide useful information for the design of RDP groups in a typical pile–superstructure–quay wall system.

中文翻译：

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刚性排水桩-上部结构-岸墙系统在横向扩展下的响应

众多震害实例表明，液化横向扩展是桩基破坏的主要原因。刚性排水桩（RDPs），具有两条排水槽和塑料排水板，是一种兼顾承载力和排水功能的新型抗液化桩。进行了一系列 1 g振动台试验，以分析受横向扩展影响的 RDP-上层建筑-岸壁系统的地震响应。三个级别的地震强度 - 小（峰值地面加速度 (PGA) 为 0.05 g）、中等（PGA = 0.1 g）和大（PGA = 0.2 g) – 进行了调查。分析了使用 RDP 的抗液化性能的改进。还检查了远场 (FF) 和近场 (NF) 地面运动的影响。实验结果表明，RDPs能有效降低砂层的液化程度和水平流动。此外，在RDP上建造的上部结构的内力和位移都较小。发现 NF 地震动引起的地震响应比 FF 地震动更显着，但不能忽视 FF 地震动的影响。试验结果可为典型桩-上部结构-岸壁系统中 RDP 组的设计提供有用的信息。